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DMC-1700/1800 Chapter 7 Application Programming • 161
EN
In this example, the message “Enter Length” is displayed on the computer screen. The controller waits for the
operator to enter a value. The operator enters the numeric value which is assigned to the variable, LENX.
Cut-to-Length Example
In this example, a length of material is to be advanced a specified distance. When the motion is complete, a cutting
head is activated to cut the material. The length is variable, and the operator is prompted to input it in inches. Motion
starts with a start button which is connected to input 1.
The load is coupled with a 2 pitch lead screw. A 2000 count/rev encoder is on the motor, resulting in a resolution of
4000 counts/inch. The program below uses the variable LEN, to length. The IN command is used to prompt the
operator to enter the length, and the entered value is assigned to the variable LEN.
#BEGIN LABEL
AC 800000 Acceleration
DC 800000 Deceleration
SP 5000 Speed
LEN=3.4 Initial length in inches
#CUT Cut routine
AI1 Wait for start signal
IN “enter Length(IN)”, LEN Prompt operator for length in inches
PR LEN *4000 Specify position in counts
BGX Begin motion to move material
AMX Wait for motion done
SB1 Set output to cut
WT100;CB1 Wait 100 msec, then turn off cutter
JP #CUT Repeat process
EN End program
Inputting String Variables
String variables with up to six characters may input using the specifier, {Sn} where n represents the number of
string characters to be input. If n is not specified, six characters will be accepted. For example, IN “Enter X,Y or
Z”, V{S} specifies a string variable to be input.
Output of Data (Numeric and String)
Numerical and string data can be ouput from the controller using several methods. The message command, MG, can
output string and numerical data. Also, the controller can be commanded to return the values of variables and
arrays, as well as other information using the interrogation commands (the interrogation commands are described in
chapter 5).
Sending Messages
Messages may be sent to the bus using the message command, MG. This command sends specified text and
numerical or string data from variables or arrays to the screen.